[Feature] Mention FixItemDecorationRecyclerView in README.

Author: zhanghai

README.md

@@ -59,6 +59,8 @@ For more customization, please use the methods on [`FastScrollerBuilder`](librar
 
 The default `ViewHelper` implementation for `RecyclerView` supports both `LinearLayoutManager` and `GridLayoutManager`, but assumes that each item has the same height when calculating scroll, as there's no common way to deal with variable item height. If you know how to measure for scrolling in your specific case, you can provide your own `ViewHelper` implementation and fast scroll will work correctly again.
 
+If you are using any `RecyclerView.ItemDecoration` that implements `onDrawOver()`, you might be interested in [`FixItemDecorationRecyclerView`](library/src/main/java/me/zhanghai/android/fastscroll/FixItemDecorationRecyclerView.java) which can fix the drawing order.
+
 You can also refer to the [sample app source](sample/src/main/java/me/zhanghai/android/fastscroll/sample) for how things like window insets and lift on scroll are implemented.
 
 ## License